Around line 1400 of Doc/howto/clinic.rst

  ``two-pass``
    A buffer like ``buffer``.  However, a two-pass buffer can only
    be written once, and it prints out all text sent to it during
    all of processing, even from Clinic blocks *after* the

I've rarely be kept in such suspense ! Unless it's a reference to Monty Python's "The Man Who Finishes Other People's Sentences". In which case, I must say it's